Grate.



Patented Oct. I7, |899. n. GULL.

GBATE.

(Application led Dec. 28, 1897.)

(No Model.)

*Vq. TME. HV//l WH te C A A f/ Wl WIV/I nllll l l l l l llll. I l l ll Alllll llTnllJl WMI RICHARD GOLIJ, QF FRANKFORT-ON-TI-IE-MAIN, GERMANY.

GRAT.

SPECIFICATION forming part of Letters Patent No. 634,886, eaten october 1*?, ieee.

Application filed Decemhel-ZS, 1897. Serial No. 663,915. (No model To all who/1t it nitty concern.-

Be it known that I, RICHARD GOLL, manufacturer, residing at Frankfort-on-the-Main, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in Gra-tes, (patented in Germany, No. 72,369, August 24,1892; in Great Britain, No. 16,329, September 12,1892; in Spain, No.13,793`,November 10, 1892; in Belgium, No. 101,505, September 26,1892; in Italy, No. 34,937, September 29, 1893; in Switzerland, No. 5,946, September 3, 1892; in Norway, No. 3,933, November 21, 1893; in Sweden, No. 5,737, September 13, 1892; in Luxemburg, No. 1,687, September 14, 1892; in Austria, No. 432,017, September 5, 1892, and in France, No. 214,802, .Iuly 11, 1891, and No. 214,802, December 16, 1892,) of which the following is a specification.

r1`his invention has reference to the con-v struction of grates in a manner that the draft of'the air entering at the bottom of the grate is regulated and equalized along the gratebars. I obtain this object by varying the width of the interstices `at the under side or the flanks of the bars, whereas the distance of the edges of the grate-bars at the upper surface remains the same throughout their total length. For this purpose I enlarge the section of every bar under the grate-surface, so as to obtain a tapering interstice.

In the accompanying drawings I have shown different:- ways in which I carry out myinvention.

In all examples the spaces between adjacent bars, from the bottoms of the bars toward but not to the tops of'said bars, are widest toward the end of the bars, growing narrower toward the middle of the bars, whereby the draft or current of airis reduced toward the middle of the bar, because it is this point where it is usually strongest; but it is understood that for the other conditions of draft another regulation may be fitted.

Figure 1 is an' elevation of a .grate-bar.

Figs. 2 and 3 are sectional views on lines 2 grate embodying a third modification of my invention. Figs. 9, 10, and 11 are sections on lines 9 9, 10 10, and 11 11 of Fig. 8.

Figs. 1, 2, and 3 show a grate-barA, having a triangular or flaring fillet or enlargement aadded to the bottom of each side of the bar and of course cast integralwith it and decreasing in size toward'the ends of the bar. As the upper edge h b of the fillet is inclined from the middle toward the under edge ofthe bar the fillets taper toward the ends of the bar, and the interstice c between two fillets of two adjacent grate-bars, when several bars are secured together to form a grate, in creases accordingly toward the ends.

Figs. 4, 5, 6, and 7 show fillets a of' semicircular section and curved to approach the middle of the upper edge of the bar, thereby contracting the space between adjacent bars toward their middle portions.

Figs. 8, 9, 10, and 11 show al grate with several grate-bars A.

Instead of a fillet sharply set olfl from the flank of lthe grate-bar the under part of the bar is thickened itself in adiiferent measure at different points. The grate-bars, according to Figs. 8, 9, 10, and 1 1, show almost par-l allel flanks in the middle of the bar, which converge toward the ends to form a triangular section of the bar, thereby contracting the spaces between adjacent bars at those parts where in old forms of grates the draft of air is the greatest.

Now what I claim, and desire to secure by Letters Patent, is the following:

1. Agrate-bar adapted with other bars to forma slotted grate, said grate-bar having a uniform thickness at its upper surface throughout the slot-forming part, and a gradually-varying thickness in the direction of its length below said upper surface, for the purpose set forth.

2. A grate having bars forming slots between them, said bars forming slots ol' uniform width in the direction of their length at the upper surface of the bars, the bars varying in Width in the direction of theirlength below the upper surface, whereby more space is left be- IOL) the grate, Suid bars decreasing in width tothe direction ofV the length of the bar below ward their ends and below the upper surface7 the upper surface of the bar, as set forth.

whereby the space between the bers is narrow In testimony whereof I have signed my at the middle of the bars and Wider toward name to this specification in the presence of 5 the eids, as set forth. two subscribing Witnesses.

4. grate-bar, adapted with other bars to form a slotted grate, said barbeing of uniform R101 {ARD' GOLL thickness at its upper surface throughout the lVitnesses:

Slot-forming part and having a. illet or en- ANDREAS JENSEN, 1o largement of graduallyevarying thickness in FRANK H. MASON. 

